Download | - View final version: Potential for thermal breakage of sealed double-glazing units (PDF, 1.6 MiB)
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DOI | Resolve DOI: https://doi.org/10.4224/20327627 |
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Author | Search for: Sasaki, J. R.1 |
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Affiliation | - National Research Council of Canada
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Format | Text, Issue |
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Physical description | 6 p. |
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Subject | Heat performance; thermal stresses; sealed glazing units; crackings (breaking); breakage; windows; heat reflecting glass; heat absorbing glazings |
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Abstract | Both panes of factory-sealed double-glazing units are susceptible to thermal breakage. The outer pane experiences large thermally induced stresses when solar radiation falls on the sealed unit in cool weather. The breakage potential is even greater for units with heat-absorbing or heat- reflecting glass in the outer pane than for units with a clear outer pane. The inner pane experiences a high thermal stress when the outdoor air temperature is very low and the unit is subjected to localized heating. The breakage potential of the inner pane is greater for heat-reflecting units with a low U-value than for clear, heat-absorbing, or high-emissivity heat-reflecting units. Measured and calculated values of thermal stress for inner and outer panes of sealed glazing units indicate that thermal stress by itself should not cause glass breakage. Extensive breakage failure will only occur if the thermal stress is augmented by other tensile stresses or if weak or damaged glass is used. In the absence of a reliable method of predicting the probability of thermal breakage in sealed units, however, all factors that can possibly reduce the potential for breakage should be accommodated in design. This is especially true for units with heat-absorbing and heat-reflecting glass. |
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Publication date | 1970-09 |
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Publisher | National Research Council of Canada. Division of Building Research |
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Series | |
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Translation of | |
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Language | English |
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Peer reviewed | No |
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NRC number | NRC-IRC-1781 |
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NPARC number | 20327627 |
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Export citation | Export as RIS |
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Report a correction | Report a correction (opens in a new tab) |
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Record identifier | 19fbd0ae-ab83-4682-ad1f-fa9e4afdba10 |
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Record created | 2012-07-18 |
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Record modified | 2023-01-24 |
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